Speedo needle bouncing

[waterdog]

Does anyboby have an idea why my speedometer needle is bouncing when running,its impossible to read speed cause jumps about 10 kmh back and forth,,,,,,,
,,,thanks folks!!

[kdiqq]

Yes!!!! I had to pull apart an old speedo and learned how they work. So you have a speedo drive in your differential and turns at a rate consistent with your driveline. This spins a cable that turns the odometer and then turns this metal wheel. This wheel rubs against a spring-loaded disk that drives the speedo. The faster the wheel spins, the more it can rotate the disk, thus moving the needle higher up the speedo. Yours is jumping because the wheel and disk are skipping. This is normal for a speedo of this type and age and your odometer is still correct.

Sadly I have no idea how to fix it. A lot of guys here swap out to an electronic speedo.

[63rover]

A bouncing speedo needle is usually a sign that the speedo cable needs regreasing. While you have it out check for broken filaments. If you have any replace it.

Cheers, Clive

[stiffler4444]

Gotta do the same to mine, I figure it's the cable as 63Rover suggests

[waterdog]

soooo.. to check the cable should i dissasembly bottom end, plus remove gauge??? or can i pull the cable from one end???

[63rover]

I haven't had to one on the Pinz, sorry. Best to check the manuals.

[Jimm391730]

Most speedo drive cables were round, with square swaged ends. I would expect that you can just pull the cable out of the housing from either end. But as I've never done this to a Pinz I can't say I know for sure. But it does make me think that I should do some maintenance and grease mine as well, it hasn't been touched in at least 12 years...

[Texas710]

They make cable spray lubricant for motorcycles, wonder if this could be used instead of pulling out the cable? They can be a bear to get back in their sheaths and you can fray them pretty easy, at least on same vintage bikes.

Though, no experience with pinz speedo cables, just thinking out loud.

[stiffler4444]

If I get the weather and time, I might try and pull mine this weekend. If so, I will report back the process.

[ako]

They make cable spray lubricant for motorcycles, wonder if this could be used instead of pulling out the cable? They can be a bear to get back in their sheaths and you can fray them pretty easy, at least on same vintage bikes.

Though, no experience with pinz speedo cables, just thinking out loud.

My thinking is on the same track as yours. I have a tool for lubricating motorbike cables like this :



It is a motion pro cable luber (google it if you want to see it working). It works well but I think the Pinz speedo cable would be too large of a diameter to work.

But, you could buy a small plastic funnel and put it over the cable end. Then use electrical tape or whatever to seal between the cable sheath and funnel end.

Then holding the funnel upright just keep spraying WD-40 into the space between the the cable and the sheath. Keep spraying until it has hopefully seeped inside the guts of it.

I think 3 or 4 cans would do

[63rover]

The usual method is to pull the core from the top (back of the speedo) clean and inspect for broken wires. If none are found grease (not oil) and carefully insert being careful to gently turn as needed to re-engage the end drive. Broken or frayed wires require a cable replacement. Likely this is the same but check the manual just to be certain.

Cheers, Clive